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BrandRCA
ClassR-F Power Amplifier Pentode
BaseMedium 7-Pin Ceramic Bayonet
Filament12.6V @ 700mA
Construction
Primary TypePentode
EnvelopeST-16
Base MaterialCeramic
Sections1
Filament / Heater
Heater NotesCoated Unipotential Cathode
Absolute Maximum Ratings
Plate Voltage500 V
Plate Dissipation12 W
Grid 2 Voltage200 V
Grid 1 Voltage-200 V
Cathode Current80 mA
H-C Voltage100 V
Audio Performance
Key Features
- Internal shielding
- Small metal cap
- Unipotential cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B Telephony | 500V | 3400 | - | - | 30mA |
| Class C Telegraphy - Pentode Connection | 500V | - | - | - | 60mA |
Application Notes
The internal shielding in this tube is unusually effective; it generally is necessary to introduce external feedback in those circuits which depend on the control-grid-to-plate capacity for oscillation.
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